Date: Thu, 15 Mar 2007 20:41:54 -0700 From: Garrett Cooper <youshi10@u.washington.edu> To: freebsd-questions@freebsd.org Subject: Re: SUMMARY: CPUTYPE for VIA EPIA M-Series Mini-ITX Message-ID: <45FA1202.6010405@u.washington.edu> In-Reply-To: <AB1F6806-C391-4CDC-9CA4-387BC5A219B6@goldmark.org> References: <682271DA-A9C3-48E0-A18E-8546A7725864@goldmark.org> <20070315084846.GA15959@epia-2.farid-hajji.net> <499c70c0703150316x67bd1783g53ad5f7d04ed2682@mail.gmail.com> <AB1F6806-C391-4CDC-9CA4-387BC5A219B6@goldmark.org>
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Jeffrey Goldberg wrote: > [mailed, posted and bcc'ed to off list respondents] > > > First let me quote my original query: > >> I have one of these >> >> CPU: VIA C3 Nehemiah (999.52-MHz 686-class CPU) >> Origin = "CentaurHauls" Id = 0x691 Stepping = 1 >> Features=0x380b035<FPU,DE,TSC,MSR,MTRR,PGE,CMOV,MMX,FXSR,SSE> >> >> http://www.via.com.tw/en/products/mainboards/motherboards.jsp?motherboard_id=81 >> >> >> And 6.2-RELEASE p2 >> >> When I set CPUTYPE=c3 in /etc/make.conf the world seemed to build just >> fine, but (at least) gcc ended up broken. Most compiling attempts >> after that ended up with gcc reporting an internal error. >> >> Now that I've entered the FreeBSD world and am building everything >> from source, I would like to take advantage of that by compiling for >> my system. >> >> Does anyone have a similar system? And what CPUTYPE or local tuning >> do you recommend? >> >> A dmesg for the system is available at >> >> http://ntp0.goldmark.org/temp/dmesg > > I've had two responses telling me that the make.conf defaults are just > fine, and two (one off list) recommending i686/pentiumpro. One for > pentiumpro and the other for i686, but as Andreas Rudish helpfully > pointed out, those two are probably the same thing. No one suggested > using c3. In fact, cpghost emphatically stated not to use C3 in make.conf > > Adbullah Ibn Hamad Al-Marri also helpfully directed me for information > about safe CFLAGS to > > http://gentoo-wiki.com/Safe_Cflags > > where the entry for the Via Nehemiah says: > > ============================================================== > Nehemiah (C5XL)/C5P (Via) > > CHOST="i686-pc-linux-gnu" > CFLAGS="-march=i686 -msse -mmmx -O2 -pipe -fomit-frame-pointer" > CXXFLAGS="${CFLAGS}" > > note: The more recent versions of the C3 do support the cmov instruction > and hence -march=i686. If you must be compatible with all VIA C3 > versions, do not use the settings in this section. > > note: it is also possible to use "-march=c3-2". <-- Comment to this: I > got a problem "compiler can't create executables" with this setting. > > note: I had much better luck with -Os than with -O2. The cache on the > nehemiah chips is really small, so making the executables small helps > more than anything else. > ============================================================== > > The off list response added > > >> - Setting CPUTYPE to pentium, or pentiumpro both work fine. IIRC, >> the C3 designation is Linux-specific and doesn't exist for >> FreeBSD. >> > > If everybody agrees that the c3 designation is unwise to use, then > probably the distributed > > /usr/share/examples/etc/make.conf > > The off list responded gave extremely helpful and detailed information > about trimming the kernel for a similar box. I've already done most of > what that recommends. > > In sum, don't use the c3 specification in /etc/make.conf even though the > example would suggested otherwise. > > Thanks all for your help > > -j Indeed. After reading a mock up of the processor is appears that it's an Intel 686 clone. See: <http://www.digit-life.com/articles2/roundupmobo/via-c3-nehemiah.html>; (it's a bit old for an article, so I hope you don't mind the dust :)..). -Garrett
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